Koehler, R.D.Reger, R.D.Sicard, K.R.Spangler, E.R.2013Yukon River bridge landslide: Preliminary geologic and geotechnical evaluationASCII tabular files, reportPreliminary Interpretive ReportPIR 2013-6Fairbanks, Alaska, United StatesAlaska Division of Geological & Geophysical Surveys69 phttp://dx.doi.org/10.14509/25642This report presents the findings of a geologic and geotechnical evaluation of a landslide at the Yukon River bridge (the E.L. Patton Bridge). The Yukon River bridge landslide occurred in fall 2012 between approximately 375 and 575 feet west of the bridge. Although there was no damage to the bridge foundation, the landslide's close proximity to the bridge and concerns over additional failures prompted multiple evaluations, including landslide documentation, drainage assessments, and geotechnical studies. This report was prepared to convey the general characteristics of the rock mass, characteristics of rock discontinuities, and the geomorphic expression of the 2012 landslide in the vicinity of the bridge. We determined that the fractured bedrock and steep slopes in the bridge vicinity are prone to slope failure. However, this assessment should be considered preliminary and should not be used to determine areas of potential future slope instabilities. A significant amount of additional exploration and slope stability analysis is required to fully understand the landslide hazard in the area of the bridge, as well as the potential for reactivation and/or expansion of the 2012 landslide into adjacent slopes.This report was prepared to convey the general characteristics of the rock mass, characteristics of rock discontinuities, and the geomorphic expression of the 2012 landslide in the vicinity of the Yukon River bridge. However, this assessment should be considered preliminary and should not be used to determine areas of potential future slope instabilities. A significant amount of additional exploration and slope stability analysis is required to fully understand the landslide hazard in the area of the bridge, as well as the potential for reactivation and/or expansion of the 2012 landslide into adjacent slopes.The geospatial data file provided in this digital data distribution package is a compilation of the manuscript tables 1 and 2. The table headers and data organization have been slightly modified to make the data readily accessible to users who wish to view outcrop locations and descriptions via GIS or other software. The DGGS metadata standard extends the FGDC standard to include elements that are required to facilitate our internal data management. These elements, referred to as "layers," group and describe files that have intrinsic logical or topological relationships and correspond to subdirectories within the data distribution package. The metadata layer provides the metadata, codesets, or other documentation files applicable to all layers. Attribute information for each data layer is described in this metadata file under the "Entity_and_Attribute_Information" section. Data layer contents: >sample-location-details: GPS coordinates and rock mass properties for each outcrop field station.2013ground conditioncomplete none planned-149.732431-149.72038565.875738 65.872301ISO 19115 Topic CategorygeoscientificInformationAlaska Division of Geological & Geophysical SurveysAlluvial FanAlluviumCoastal and River HazardsColluvial DepositsColluviumDrainage PatternsEarthquake Related HazardsEngineeringErosionFracturingGeological ProcessGeologyGeomorphologyGeotechnicalHazardsLandslideLoessPermafrost and PeriglacialSlope Instability HazardsSurficialTranslational LandslideTransportation CorridorAlaska Division of Geological & Geophysical SurveysDalton HighwayLivengood QuadrangleTrans-Alaska PipelineYukon RiverThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.Alaska Division of Geological & Geophysical SurveysGIS Managermailing and physical 3354 College Rd FairbanksAK99709-3707USA907-451-5020dggsgis@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysThis report presents the findings of a geologic and geotechnical evaluation of a landslide at the Yukon River bridge, conducted by the State of Alaska, Division of Geological & Geophysical Surveys (DGGS) through a reimbursable services agreement with the State of Alaska Department of Transportation & Public Facilities (ADOT&PF). De Anne S. P. Stevens provided a technical review of the report.The attributes listed in this dataset were transcribed from field-data collection sheets. The field-data sheets were also scanned and included as an appendix to the manuscript. The geologic interpretations presented in this report have undergone technical review by a geologist of comparable technical expertise. We incorporated the reviewer's suggestions into the final draft when deemed appropriate.not applicableUsers should note that this table is a compilation of the information provided in tables 1 and 2 to the manuscript. These tables provide only the outcrop locations and rock mass values. To see all of the outcrop measurements and descriptions, users should refer to the field-data sheets (see Appendix B of the manuscript).We assigned a "station number" to each outcrop discussed in this report. Near the center of each outcrop, we recorded a single GPS waypoint to approximate the location of each "station." A station number (and GPS waypoint) was not recorded for the area between the stations 10 and 11. However, we did record observations in this area.Alaska Department of Transportation & Public Facilities (ADOT&PF)2003Alaska field rock classification and structural mapping guideAlaskaState of Alaskapaper2003publication dateAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003geotechnical - geomorphic observations and preliminary interpretationBarton, Nick1978Suggested methods for the quantitative description of discontinuities in rock massesInternational Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstractsv. 15, no. 6, p. 319-368Oxford-New York, InternationalPergamonpaper1978publication dateBarton, Nick, 1978geotechnical - geomorphic observations and preliminary interpretationGeotechnical - geomorphic observations and preliminary interpretation - The Yukon River bridge landslide field review was performed August 25-29, 2013, by Rich Koehler, Karri Sicard, and Eleanor Spangler of DGGS and Richard 'Dick' Reger of Reger's Geologic Consulting. Bedrock outcrops along the base of the Yukon River bluff were inspected for the presence of faults, fractures, shears or weathering zones, and/or other features that could provide information from which to infer subsurface conditions of bedrock farther upslope. Quantitative descriptions of rock mass and discontinuity data are based on the methodology of Barton (1978). Rock mass and discontinuity survey data sheets from the Alaska Field Rock Classification and Structural Mapping Guide (ADOT&PF, 2003) were used to record the field observations. Key rock characteristics that were documented include lithology, color, grain size, field compressive strength, rock mass fabric, block size, and state of weathering. Discontinuity surveys at each outcrop station include information on type of discontinuity, dip, dip direction, persistence, termination, aperture, nature of filling, strength of filling, surface roughness, surface shape, waviness, joint roughness coefficient, and presence of water. Detailed definitions for each of these parameters are provided in ADOT&PF (2003). Discontinuity orientations were measured with a Brunton compass, using standard geologic field techniques. We compiled the field data and LiDAR observations into a preliminary report that summarizes the general characteristics of the rock mass, characteristics of rock discontinuities, and the geomorphic expression of the 2012 landslide and the surrounding area. Alaska Department of Transportation & Public Facilities (ADOT&PF), 2003 Barton, Nick, 1978 2013pointWorld Geodetic System of 1984World Geodetic System of 19846378137298.257223563pir2013-6-sample-location-detailsGPS coordinates and rock mass properties for each outcrop field station.Alaska Division of Geological & Geophysical Surveyssample-location-detailsStation_NumberLabel assigned to identify the station.Alaska Division of Geological & Geophysical SurveysNULLBlank (NULL) field values indicate that this value was not recorded.Alaska Division of Geological & Geophysical SurveysAlphanumeric characters which correlate to field-data collection sheets provided in Appendix B of the manuscriptLatitudeLatitude, WGS84Alaska Division of Geological & Geophysical SurveysNULLBlank (NULL) field values indicate that this value was not recorded.Alaska Division of Geological & Geophysical Surveys65.8723010465.87573804decimal degreesLongitudeLongitude, WGS84Alaska Division of Geological & Geophysical SurveysNULLBlank (NULL) field values indicate that this value was not recorded.Alaska Division of Geological & Geophysical Surveys-149.732431-149.720385decimal degreesDescriptionDescription of the station locationAlaska Division of Geological & Geophysical SurveysNULLBlank (NULL) field values indicate that this value was not recorded.Alaska Division of Geological & Geophysical SurveysA station number (and GPS waypoint) was not recorded for area between the stations 10 and 11. However, we did record observations in this area.LithologyDescription of the rock typeAlaska Division of Geological & Geophysical SurveysFree text, terminology is generally consistent with: Neuendorf, K.K.E., Mehl, J.P., Jr., and Jackson, J.A., ed., 2005, Glossary of Geology: American Geological Institute, 799 p.ColorColor of the rock, a delimited list of options is provided in data sheet template.Alaska Division of Geological & Geophysical SurveysAlaska field rock classification and structural mapping guide, rock mass description data sheetAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003, Alaska field rock classification and structural mapping guide: State of Alaska, ADOT&PF Geotechnical Procedures Manual, 31 p.Grain_SizeGeneral size of rock grains, a delimited list of options is provided in data sheet template.Alaska Division of Geological & Geophysical SurveysAlaska field rock classification and structural mapping guide, rock mass description data sheetAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003, Alaska field rock classification and structural mapping guide: State of Alaska, ADOT&PF Geotechnical Procedures Manual, 31 p.Compressive_StrengthGeneral assessed compressive strength of rock at the station, classification parameters and a delimited list of options are provided in data sheet template.Alaska Division of Geological & Geophysical SurveysAlaska field rock classification and structural mapping guide, rock mass description data sheetAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003, Alaska field rock classification and structural mapping guide: State of Alaska, ADOT&PF Geotechnical Procedures Manual, 31 p.WeatheringState of weathering, a delimited list of options is provided in data sheet template.Alaska Division of Geological & Geophysical SurveysAlaska field rock classification and structural mapping guide, rock mass description data sheetAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003, Alaska field rock classification and structural mapping guide: State of Alaska, ADOT&PF Geotechnical Procedures Manual, 31 p.FabricGeneral pattern of discontinuities throughout the outcrop, a delimited list of options provided is in data sheet template.Alaska Division of Geological & Geophysical SurveysAlaska field rock classification and structural mapping guide, rock mass description data sheetAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003, Alaska field rock classification and structural mapping guide: State of Alaska, ADOT&PF Geotechnical Procedures Manual, 31 p.Block_SizeGeneral size of the rock blocks that are defined by outcrop fabric; classification parameters and a delimited list of options are provided in data sheet template.Alaska Division of Geological & Geophysical SurveysAlaska field rock classification and structural mapping guide, rock mass description data sheetAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003, Alaska field rock classification and structural mapping guide: State of Alaska, ADOT&PF Geotechnical Procedures Manual, 31 p.Num_Discontinuity_SetsDiscontinuity is a collective term used here to describe breaks in the outcrop surface; these may include: joints, fractures, bedding planes, rock cleavage, foliation, shear zones etc. This value provides a count of intersecting discontinuities found at each outcrop.Alaska Division of Geological & Geophysical SurveysAlaska field rock classification and structural mapping guide, rock mass description data sheetAlaska Department of Transportation & Public Facilities (ADOT&PF), 2003, Alaska field rock classification and structural mapping guide: State of Alaska, ADOT&PF Geotechnical Procedures Manual, 31 p.State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveysmailing and physical 3354 College Road FairbanksAK99709-3707USA907-451-5020907-451-5050dggspubs@alaska.gov8 am to 4:30 pm, Monday through Friday, except State holidaysPlease view our website (http://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.PIR 2013-6The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity, whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requestor or anyone else exceed the fee paid for the electronic service or product.DGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.see http://dx.doi.org/10.14509/25642 ASCII tabular fileshttp://dx.doi.org/10.14509/25642Free download20131029Simone Montaynemailing and physical3354 College RoadFairbanksAK99709-3707USA907-451-5020FGDC Content Standard for Digital Geospatial MetadataFGDC-STD-001-1998If the user has modified this metadata file in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent this metadata file, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.http://www.dggs.alaska.gov/metadata/dggs.extdggs metadata extensions